Copper alloy chromium-free passivation solution

Abstract

The invention discloses a copper alloy chromium-free passivation solution which is composed of, by weight, 20-30 parts of lanthanum alloy salt, 30-40 parts of hydrogen peroxide, 1-5 parts of amino acid, 5-10 parts of sodium malate, 1-5 parts of a stabilizer and 30-50 parts of deionized water. The copper alloy chromium-free passivation solution is good in passivation effect, binding force between a passivation film and a plating is large, a copper alloy treated by the passivation solution is obviously improved in corrosion resistance, and the environment pollution problem can be effectively avoided.

Description

technical field

[0001] The invention relates to the technical field of surface treatment, in particular to a chromium-free passivation solution for copper alloys. Background technique

[0002] In order to improve the corrosion resistance of copper alloys, increase surface gloss and anti-pollution ability, passivation treatment is generally required after surface treatment of copper alloys to form a dense and stable film on the surface.

[0003] In the prior art, chromate passivation solution is usually used for passivation, but chromate passivation solution contains hexavalent chromium, which is highly toxic and causes serious environmental pollution. Plated parts are likely to cause harm to human health in the process of production and recycling .

[0004] Among the inorganic salt passivation formulas and processes, high chromic acid passivation causes serious environmental pollution and has a negative impact on human health. Low-chromium passivation solutions and ultra-lo...